Calculation method based on a multi-scale model instead of fluid-solid coupling

Abstract

The invention discloses a calculation method based on a multi-scale model instead of fluid-solid coupling, and belongs to the field of hemodynamic calculation. The method is a new method for simulating the elasticity of the blood vessel wall to replace fluid-solid coupling calculation; and obtaining necessary geometric parameters based on the blood flow three-dimensional model, and calculating a capacitance value according to a formula. A capacitor is connected to an outlet of the blood flow model in series, and then parameters such as blood vessel wall deformation and a blood flow field are obtained through a finite element calculation method. The method can replace a fluid-solid coupling algorithm which is complex in arrangement and long in calculation time, and the calculation speed ofhemodynamics is increased.

Description

Technical field: [0001] The invention provides a calculation method for simulating the elasticity of blood vessel walls based on a multi-scale model to replace fluid-solid coupling, and belongs to the field of hemodynamic calculations. Background technique [0002] When calculating hemodynamics, the CFX subroutine in ANSYS software is generally used. This calculation method can only simulate the flow of blood in a rigid tube. But the physiological reality is that blood flows in elastic tubes, the walls of blood vessels are elastic, and the elasticity of blood vessel walls has an indelible influence on blood flow. After the fluid exerts an influence on the elastic tube, the elastic tube also exerts an influence on the fluid, and the influence between the two is reciprocating. Fluids can exert influence on rigid pipes, but rigid pipes cannot feed back this acquired influence back to the fluid. Therefore, when calculating the hemodynamics, the force exerted by the elasticity...

AI Technical Summary

Problems solved by technology

When the 3D model performs multi-process calculation, the 3D model grid will be cut into several pieces, and each process will calculate one piece, so there is no guarantee that each process will include the exit or entry boundary

For processes that do not include the entry and exit boundaries, this subroutine will not be called, and the information exchange between models cannot be completed.

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